Cosmic Ray

Cosmic Ray

Cosmic rays are high speed, i. e. high energy particles, mainly originating in outer space, outside the Solar system. They may produce showers of secondary particles that penetrate the Earth's atmosphere and sometimes even Earth's surface.

The term ray is historical as cosmic rays were thought to be electromagnetic radiation.

Most primary cosmic rays are composed of well known, stable subatomic particles that normally occur on Earth, such as protons, other atomic nuclei, or electrons. About 90% of cosmic rays are simple protons, i. e. hydrogen nuclei; 9% are helium nuclei or alpha particles, and 1% are the nuclei of heavier elements. These nuclei constitute 99% of the cosmic rays. Solitary electrons (similar to beta particles) constitute much of the remaining 1%. A very small fraction are stable particles of antimatter, such as positrons or antiprotons, and the precise nature of this remaining fraction is an area of active research.

Read more about Cosmic Ray:  Introduction, Primary Cosmic Rays, Secondary Cosmic Ray Particles, Detection By Particle Track-etch Technique, Research and Experiments, History

Other articles related to "cosmic ray, cosmic rays, cosmic":

Cosmic Rays - Effects - Role in Climate Change - Suggested Mechanisms
... have argued that solar variations modulate the cosmic ray signal seen at the Earth and that this would affect cloud formation and hence climate ... Cosmic rays have been experimentally determined capable of producing ultra-small aerosol particles, orders of magnitude smaller than cloud condensation nuclei (CCN) ... about an ongoing CERN CLOUD research project to detect any Cosmic ray forcing is challenging since on wide spread time scales changes in the Sun’s magnetic activity ...
Dihydrogen Cation - Formation
... The dihydrogen ion is formed in nature by the interaction of cosmic rays and the hydrogen molecule ... H2 + cosmic ray → H2+ + e- + cosmic ray ... Cosmic ray particles have enough energy to ionize many molecules before coming to a stop ...
TRACER (cosmic Ray Detector)
... Transition Radiation Array for Cosmic Energetic Radiation (TRACER) is a balloon flown cosmic ray detector built and designed at the University of Chicago ... is designed to measure the energy spectra of cosmic ray nuclei with atomic numbers between five and twenty-six (boron to iron) ...
Cosmic-ray Observatory - Observatories and Experiments
... There are a number of cosmic ray research initiatives ... GAMMA High Energy Stereoscopic System High Resolution Fly's Eye Cosmic Ray Detector MAGIC (telescope) MARIACHI Pierre Auger Observatory Telescope Array Project WALTA (Washington Large ...
Cosmic Ray - Effects - Role in Climate Change - Geochemical and Astrophysical Evidence
... the galactic spiral arms of the Milky Way Galaxy, and that cosmic ray flux variability is the dominant "climate driver" over these time periods ... paleoclimate picture that emerged from geological criteria, while cosmic ray flux would do ... geochemical evidence both on temperature, cosmic rays influence and as well astrophysical deliberations suggesting a major role in climate variability over ...

Famous quotes containing the words ray and/or cosmic:

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